12409855 has 4 divisors (see below), whose sum is σ = 14891832. Its totient is φ = 9927880.

The previous prime is 12409849. The next prime is 12409879. The reversal of 12409855 is 55890421.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12409855 - 2¹⁵ = 12377087 is a prime.

It is a super-2 number, since 2×12409855² = 308009002242050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12409855.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1240981 + ... + 1240990.

It is an arithmetic number, because the mean of its divisors is an integer number (3722958).

Almost surely, 2^12409855 is an apocalyptic number.

12409855 is a deficient number, since it is larger than the sum of its proper divisors (2481977).

12409855 is an equidigital number, since it uses as much as digits as its factorization.

12409855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2481976.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 12409855 is about 3522.7624103819. The cubic root of 12409855 is about 231.5202071594.

The spelling of 12409855 in words is "twelve million, four hundred nine thousand, eight hundred fifty-five".